Fibromyalgia (or Fibromyalgia syndrome, FMS) is a common condition that is thought to affect as many as 1 in 25 people, and more women than men. It causes pain, aching and stiffness in muscles, ligaments and tendons throughout the body. It may affect one part of the body or several different areas. It can be a difficult condition to diagnose as the symptoms are similar to those of a number of other conditions.
